| NOUN | phenomenon | rest energy | the energy equivalent to the mass of a particle at rest in an inertial frame of reference |
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| Meaning | The energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light. | |
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| Broader | energy, free energy | (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work |
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